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ZipArchive::CreateEntry Method (String, CompressionLevel)

.NET Framework 4.6 and 4.5

Creates an empty entry that has the specified entry name and compression level in the zip archive.

Namespace:  System.IO.Compression
Assembly:  System.IO.Compression (in System.IO.Compression.dll)

ZipArchiveEntry^ CreateEntry(
	String^ entryName, 
	CompressionLevel compressionLevel


Type: System::String

A path, relative to the root of the archive, that specifies the name of the entry to be created.

Type: System.IO.Compression::CompressionLevel

One of the enumeration values that indicates whether to emphasize speed or compression effectiveness when creating the entry.

Return Value

Type: System.IO.Compression::ZipArchiveEntry
An empty entry in the zip archive.


entryName is Empty.


entryName is nullptr.


The zip archive does not support writing.


The zip archive has been disposed.

The entryName string should reflect the relative path of the entry you want to create within the zip archive. There is no restriction on the string you provide. However, if it is not formatted as a relative path, the entry is created, but you may get an exception when you extract the contents of the zip archive. If an entry with the specified name already exists in the archive, a second entry is created with the same name.

The value of the LastWriteTime property for the new entry is set to the current time. Set the compressionLevel parameter to Optimal if you want the file to be compressed as much as possible. Set the compressionLevel parameter to Fastest only if you are concerned that the compression operation will not complete quickly enough for your scenario.

The following example shows how to create an entry with the optimal compression level. It also writes to the new entry by using a stream.

No code example is currently available or this language may not be supported.

.NET Framework

Supported in: 4.6, 4.5

.NET for Windows Phone apps

Supported in: Windows Phone 8.1
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